【摘要】 节点可以自由、自主地进入网络拓扑并且无须基础网络设施的特性,使得移动Ad hoc网络被广泛应用于诸如灾难救援、战场等多种环境中.传统的Ad hoc路由协议主要是基于“最短路径”来考虑,会在网络中形成局部的“热点区域”而影响网络的性能.对此,提出了一个新的参数“节点空闲度(leisure degree)”,用来体现节点当前的传输状态.基于这个参数,联合了介质访问控制(medium access control,简称MAC)层和网络层来进行跨层设计,提出了一种新的基于“节点空闲度”的自适应路由协议LDAR(leisure degree adaptive routing),采用启发式的路由选择机制,有效地实现了拥塞控制和负载分担,提高了移动Ad hoc网络的性能.通过模拟实验,结果显示了LDAR协议在静态网络和动态网络的环境下,都有比DSR协议更好的性能.更多还原

【Abstract】 The characteristic that nodes can enlist into the network topology freely and independently without any fixed infrastructure makes mobile Ad Hoc networks (MANET) widely used in various environments such as disaster rescue, battlefield and so on. Traditional Ad Hoc network routing protocols are mainly based on the condition “Shortest Path”, and possibly form many local “hotspots” to influence the performance of the network. To this point, a new metric “Leisure Degree” is presented for denoting the transmission state of the node. Based on this metric, a cross-layer design method that involves the MAC (medium access control) layer and the network layer is used to present a new routing protocol Leisure Degree Adaptive Routing (LDAR), which uses a heuristic routing select mechanism to efficiently control the congestion and share the load. This method can improve the performance of the Ad Hoc networks. Simulation results show that LDAR performs much better than the DSR routing protocol under the circumstances of both static networks and mobile networks.更多还原